Crushing-mill.



No. 652,208. Patented lune I9, |1900. R. A; HADFIELD`& A. G. McK. JACK.

GBUSHING MILL (Ne Model.)

" t has been mounted upon an approximately-up right shaft, the upper end of which has been part to the shaft a gyratory motion. The4 UNITED STATES PATENT OFFICE.

ROBERT'ABBOTT HADFIELD AND ALEXANDER GEORGE MCKENZIE JACK, OF SHEFFIELD, ENGLAND. l

CRUSHlNG-MILL.

SPECIFICATION forming' part of Letters Patent No. 652,208, lated June 19, 1900.

Applioetionle August 2, 1899. Serial No. 725,879, (No model.)

o all Awhom it may concern.-

Beit known that we, ROBERT ABBOTT HAD- FIELD and ALEXANDER GEORGE MOKENZIE J ACK, subjects of the Queen of Great Britain and Ireland,residin g at Sheiiield,in the county of York, England, have invented Improvements in Crushing-Mills, of which the following is a specification: v In crushing mills of the class generally known as gyratory crushing-mills the substances to be broken or crushed are passed through an annular chamber or space which is usually formed by and between acrusherhead whose general configuration' is conical and `to which a gyratory motion is given andV a surrounding cylindrical or other ring or wall, the Vcrushing being eected between the head andthe ring or wall bythe gyratory motion of the head causing it to lapproach and recede from every part of the ringiu succession. Usually in apparatus of this .kind the head held laterally in a-skeleton cover or spider secured upon the ring, while its lower por? -tlon has passed through abearing formed eccentrically through the boss of a rotating wheel, the arrangement being such as to imlower end of the shaft has been supported by an adjustable block, which has vtakenthe weight of the4 shaftand head and -also the downward thrust caused by the crushing operation, or sometimes the shafthas been suspended fromits upper end, for instance, by an external collar with suitable bearing-surf' face. With apparatus thus constructed it is found that owing to the frictionbetween the shaft audits support and also between the shaft and its eccentric bearing rapid wearjs caused ,and consequen tly frequent repairs are necessary.

Referring to the accompanying drawings, 5 Figure 1 is a central vertical section of a crushfV4 ing-mill constructed according to this invention, and Fig. 2 is a sectional detail View on the line A A, Fig. 1. l

` c is the crusher-head, b the surrounding ring or wall,and c the skeleton cover or spider. The crusher-headv ais, according to this invention, carried by a hollow shaft d,which is supported at or near its, upper end by means of an upright pillar e, that extends from the lower part of the mill upward within thehollow shaft. The hollowshaft d, which may advantageousl y be cast in steel, preferably mild steel, lis closed at its upper end and is there formed or provided with an internal surface or bearing f, that rests Vupon the top of-y the upright pillar e, whose lower end is Vor may be lit-ted in a socket formed in p of the apparatus.` Theupright pillar e carries the weight of the shaft d and crusherthe base-plate head a, and takes the downward thrust due to the crushing operation. The skeleton cover or spider c laterally supports the top of centric boss h extends upwardly within the hollow shaft d, and its rotation causes the lower end of the said shaft to travel in acirc'ular path, and thus imparts the necessary gyratory motion to the .shaft and its-crush-.

ing-head. Between the eccentric boss h andf the iuternal'surface of the hollow shaft d there is preferably interposedAa ring of anti- .friction-rollers i, carried in a suitable cage or frame. Fig. 2 illustrates this feature. In order to prevent dust getting tothe bearing-- surfaces within the hollowshaft, the uppery surface of the bevelawheel g maynbe faced and a ringj, of metal,'leather, or other suitable material, so arranged asto loosely fit the lower end of the hollow shaft and to restupon thefaced portion ofthe wheel. The hollow shaft extends througha central iianged ap'- erture la in an inclined diaphragm l, which,

as usual, divides the tubular frame m of the apparatus,..the said aperture being closed by a ring fn, fitting the hollow shaft and resting on the ange of the aperture. rlhe upper part of the frame formsthe crushing-chamber, and the diaphragm serves as a dischargechute, while the lower part of the frame con.- tains the bevel-wheel g, which is driven 'by means of a bevel-pinion from a belt-pulley,- as well understood. Between the bevel-wheel Ioo Y o may befprovided,and a gun-metal ring p' may alsoe r-intrcidueed between the baseplate and the bevel-wheel g, which ring may y5 be replaced by one Vof dEerent thickness should the vertical position of the wheel g require adjustment.

To enable the pillary e, and. consequently/ the crushinghead a, to be adjusted verti-y cally, the lower end of the pillar may bescrewthreaded and arranged to extend through the ,base-plate, as shown, where it may be fitted with a uut q,supported in-a bracket attached. to `the base-plate. The pillaris prevented from turning within its socket by means of a screw fr, projecting into a keyway, so that by' rotating the nut q, which may conveniently be formed as a worm-wheel and driven by a worm, the pillar may be raised or lowered, as required. By this means wear of the crushing-head a and ring b may betaken up or the degree of. tneness of the crushed material regulated.

' For the purpose ot' facilitating the proper z5 lubrication of the antifrictiou-rollers i and the gun-metal bush o the lower portionof the pillar may be made hollow and fitted with a couple o f pipes s s, leading from one or more oil-reservoirs (not shown) mounted at a suit- '30 able height on the frame Vof the apparatus, the said pipes having branches t t extending through lateral openings in the wall of the pillar e to just above the rollers and bush, respectively. y l l The bearing j will require but little lubrication, as it will be well protected from dust;

but it may be formed with a passage u, leading from an external grease-cup o, that is plug w.

1. Crushing apparatus of the kind referred to, com prisinga hollow shaft, a crushing-head carried by said shaft, a fixed ring surrounding said Crusher-head and mounted independently thereof, an upright pillar extending upwardly'wit-hin the shaft which rests upon'and is vertically supported internally at or near its upper end solely by said pillar, and means 5o for imparting gyratory. motion to said` shaft,

I as set forth. y, 2. Crushing apparatus of the kind. referred to, comprising a hollow cast-steel shaft, a crushing-head carried by said shaft, a fixed ring surrounding said crusher head and mounted independently thereof, an upright pillar extending upwardly within the shaft which rests upon and is vertically supported internally at or near its upper end solely by 6o said pillar, and'means for imparting gyratory motion to said shaft, as set forth.

' 3. Crushing apparatus of the kind referred to, comprising a hollow shaft, a crusher-head 'carried by said shaft, a xed ring surrounding said lcrusher-head and mounted independently thereof, an upright pillar extending u pformed therein and is closed by a screwwardly within the shaft which rests upon and is vertically supported internally'at or near its upper yend slely by said pillar, and an eccentric boss that extends upwardly within 7e said shaft and is adapted to impart gyratory motion to said head and shaft as set forth. l 4. Crushing apparatus of the kind referred to, comprising a hollow shaft, a crusher-head carried by said shaft',an upright pillar extend- 7 5 ing upwardly withinl the shaft which rests. upon and is vertically supported internally at or near its upper end solely by said pillar, an v eccentric boss that extends upwardly within said shaft, and an antit'riction bearing lo- 8o cated between said boss and shaft and adapted to transmit gyratory motion from said boss to said shaft and head as set forth. A

' 5. Crushing apparatus of the kind referred to, comprising a hollow shaft, a crusher-head l carried by said shaftfa fixed ring surrounding said crusher-head and'mounted independently thereof, an upright pillar extending upwardly within the shaft which rests upon and is vertically supported int rnally at or near 9o' its upper end solely byfsai pillar, and a fixed spider adaptetlto laterally support said shaft, as set forth.

6. In crushing apparatus` of the kind referred to, the combination 'of an upright pil- 95 vlar extending upwardly through a crushingchamber, a hollow shaft carrying within said chamber acrushing-head and havinga closed upper end which restsJ upon said pillar, a

wheel capable of rotation about said upright wo pillary and having an eccentric boss extending upwardly within said hollow shaft and a dust-excluding 'ring encircling the lower end of said hollow shaft and restingon said wheel, as set forth. v

7.r In a crushing apparatus of the kind refel-red to, the combination of a vertically-adjustable pillar extending upwardly through a crushing-chamber, a hollow shaft carrying within said chamber a crushing-head and no having a closed upper end which rests upon saidpillar, a wheel capable of rotation about said.upright pillarand having an eccentric boss extending upwardly within said hollow shaft, and a dust-excluding ring-.encircling the lower cnd of said hollowshaft and resting on said wheel, as set forth.

gitudinal and lateral passagesin said upright pillar to above said eccentric boss,las set forth.

.9. In a crushing lapparatus` ofgthe kind referred to, the combination ofanppright pillar extending upwardly through-a crushingchamber, a hollow shaft carryingwithin said chamber a crushinghead and having a closed upper end which rests upon said pillar," a wheel capabl of rotation about said upright pillar and ha 'ng an eccentric boss extending upwardly within said hollow shaft, antij friction-rollers interposed between said eccentric boss and said hollow shaft, and inde-` pendent lubricant-supply pipes extending through longitudinal and lateral passages in said upright pillar to above said boss and said antifriction-rol'lers respectively, as set forth. Y l.

10. In crushing apparatus of the kind referred to, the combination of an upright pillar extending ,upwardly through a crushingchamber, a'hol'low shaft carrying Within said chamber a crushing-head and having a closed t upper end which rests upon saidpillar, a

wheel capable of rotation about'said upright pillarr and having an eccentric boss extending upwardly within said hollow shaft, and

means for adjusting said pillar and crush inghead vertically, as set forth.

11. In crushing appa-ratus of the kind referred to, the combination of a crushinghead, a ring or wall surrounding said head,

a hollow shaft, a spider laterally supporting said hollow shaft, a bearing at the upper end of said shaft', an upright pillar within said shaft, a bevel-wheel with means for driving same, an eccentric boss formed on said wheel y Signed at Slieeld, England, this 14th day 4o v of July, 1899. l

AROBERT ABBOTT HADFIELD. l ALEXANDER GEORGE MCKENZIE JACK. Witnesses:

LEONARD RowLAND, RICHARD WHEELER. 

